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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f27a242c3619bb3a970c27feb6ebe407e6e7ce7d66c58b593d392828be19b1' 
  AND token = 'l+4Xo46E9Kt9CeIVrTkcD8tnZU8BbZx04AfvVaFymh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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