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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8a02ac2a11c0e03552e4a0df360668a291cc636776ce92426bf5ccf3777139' 
  AND token = 'Cu6/mWw2BloE+iENO9R4oh2Ulck9GMmaXxCNCH4Z5QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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