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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90287d22703b6a297720bf22955094afb042eec0f1c700d28aceb31a3eaada90' 
  AND token = 'yopF44POwyMDCkSnvpIDKwouoKk2RB8v9WkS9j2gZ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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