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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cbcb4f818cbbd00a4458db97f8201f185bb780bc3c27f3f4e8c8b9b627ea26' 
  AND token = '8RHMeoKL7pGkctHhYchTgao0K+YuW31PfjfZFKpNKZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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