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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393e6fd562bcc6c4904fd5542150e2c9faecdcd025811ab7a95ac45dd6ce8adb' 
  AND token = 'jNBa8a6AgZwEihHB0vNu3vUq1hUOYtm+b5gcrpYEajY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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