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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f2b03344fc14e2fe2de95057ec34dfd9543504a4f89135d02431d076a23ffe' 
  AND token = 'cSuEJfas01uZVYpio4HsfsqRCoxvxbL9CTL4bOLQrlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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