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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085cbb58f3d4de10d6fd4cb94faff3bfa82fb7badad56de0498363ce2ab84c7e' 
  AND token = 'Ln6eL4/vvpHwcxuf+Opt8L7Vozsm7c6W8xGaS4Ne9s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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