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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2f52e09cc7a2a09e30d726b502d27a17b8bf7723b10e95f9764554242d624a' 
  AND token = '4kHbgdJ2dvm+kpDH7VYYpFeesesv8qO0Z2+87PXi2TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}