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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4baba540e4392efbbeee14312b930d84036695bf576f5d3b06f128faf110ed' 
  AND token = 'IPKzcx4cFcCDitwOu95sn4MY3HEGSqDDGjEGT4lee2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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