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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02892a47f56f6784e079539bacc8f0cd4dd8c22b51c937587c439c99c950722b' 
  AND token = 'TbzFJ2nAP5IRWPa68eqiBlPsrUcv+hN/HJf5dbtjWgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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