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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40082ea0b0a8d6307f3b8f4711803400fc98fe4d03d1315423a79d0d0fa6d0f' 
  AND token = 'CJ3ztax6B09I3S08mpRL9dKZMYQ7dfDU4g0DnPqRvOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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