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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec4692c4b0e068c22d62d4e442397459fa723959159847edc004b6b5ea8daa7' 
  AND token = 'DlFdAVfbAL4Jk8QJBolbk/a4Wk6Y8w/taakXA1Zx0+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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