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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70eb4c12bf7e8b0506d4ec97f4ff2f4b83d6abefa0bcccab245f092ae472bc04' 
  AND token = 'J9FhJl/EAHx7Olv22jmoAScKVCKrLFWYXNMCKvAx+5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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