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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c7c7ffa0c2c82524f46385ad06105334701be4e07a10503451330717681954' 
  AND token = 'IiP5SNiHhgdhp+Jk4x0+O5kBCxop/mCHgf7mkLsvXCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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