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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4de6ffbbac00246f4143b1c173340412c80d37fe1c7e68eb69e44c2ab665d8c' 
  AND token = 'WX+Wx6+PCF1FuFKMCJ2rlyzcu8GYF4gUt0gOI+obaqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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