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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0261c6863589e60a253210b8ebe5956aebd0c0602dbbd6c39950072912e77067' 
  AND token = 'BXJldvsZiF8j72uQrwKdGReYszqVY4o8w8f0N1Icdp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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