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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc0f14d8d80753f55d2fe2db5d11cae86bf4ba2085fad2c4b32fa045c3d47dd' 
  AND token = 'z6JaPwEUguF4rwh35y+nWKQ37slKuhzU9/fvD5St4EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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