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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e38b12df41d084256e4dbbf92b6fd63c73a6a96d1f517bf6d4eb589db20123' 
  AND token = 'zordG6hQGz8V5lJG46E1CbSJtX6RrCZpgEVSPEdf5hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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