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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bffd7a867869cf06a9264bc897d03b526ada02f548d3c32be9f8da75e19f0cb' 
  AND token = 'reyiQK5/X7o9QLb/bsqU4JjWtBooiSVXCqm/udcX4Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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