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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9565ebda4dc3aed4948f6ef355991e5c2f757d9b2d8d18cb95be38d664ac99bf' 
  AND token = 'biYhoFcqOnNFtb0QODJ9WS1SpsbSi4fff129ofAxPJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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