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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b4232c062f33938bc00363d7b4582d2ecafb889e2bd40d6c388fbb1dd35720' 
  AND token = 'eqzLNAEKA3yfKPCCV93HzC0LzlDHvM9PQ28OYQmGEBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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