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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61eafea35f9912c62a16875889ebc3a759867641bcaaa2e829f7a694400714bf' 
  AND token = 'ZgTDxwzqG7wYIpHOSuIP6FZ1KSs05fSc1TaPhafbYHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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