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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de141103cc533b2aa3e31bd540903168c6023089ec329d38e75c14f11950cdc9' 
  AND token = '9o/utvNet5klK0krWb8wSv6cfPlHTpI0OW05C0xfha4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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