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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fce6d96d9e77674a8023ea38740eb5a46fec6a22ba6f29a363220283bb967e' 
  AND token = 'L3yUcxb+lAIWO/zNA0i8Jdm34jbWgULlSUrdnai56Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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