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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db2ee06c860b0b7deb1799bc75edf11f1a406a64d1be6dd135aa3faf3f30cc6' 
  AND token = '6QeJzlEcfBmQYhe948a/hxDKqv0UZCCbvOeOxIjNTy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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