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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd145bc04009c206fcb4aeb8a2fb1dd4593b27b60c978f8bb121a562074a0c763' 
  AND token = 'l/DOsrv2Lgi8IOOERzluDqRcNvW65uneqzmPPoELqbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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