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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a93661d7befee6aaeb8cc8eb29b783b32b77bef91d85da1dd273378749334b' 
  AND token = 'wHmB6Ldy6QTw2Z/OsXoOqRewXLGAh0cIMfaBkLN2aHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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