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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa0d8a9bd75546d980ed6647e7f27dedae3912a5bbc7148b3549a1ccdaa5d9e' 
  AND token = 'c+C3Tko62s5vkT8bGhL0TWay4iR/26pM7gY10LQ/1eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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