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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3bf47aa9835490d9c43363a66506cd2e82753b6b6026ff5aaabb0abc92e334' 
  AND token = 'JHJg1Muci/7hVZT3AkPyJ6WhOcLdev/lrDU/m74dcuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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