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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b81e794ac297d746f5c43f1ef197b8cbc9d2977b3bb9831d7e3a0c21a352cd' 
  AND token = 'J+f9UfqFPcSo3sPX2mGvs7JQpU5q4mClTvyyAN4cY8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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