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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed99c07a94be761b9cf6ef694ab2bc60546f94862e90dbeac3b65d5be150b484' 
  AND token = 'LVzOtxXRic9VurjFKV1yubb4QjtaX8TSmYa1Y1IlG5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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