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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb612a1157aabcd604e5e8d1e2be81cebf6d214239f7e39df12eca63c1d0da4' 
  AND token = '3jRCzzal0MA7x3UHQu0GQBgRJi2DezQfdRr8pFsZOus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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