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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db6cd556176c54e5a35dc4dcdbabaf65f247ca59aee41e9fb6688149ff99205' 
  AND token = 'wLsu9c3fC+e97JJ6pGE+yJD+GAs1k66cjlKgt6qhits=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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