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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2300bd70358fd773e4cc2d01a416569a138ba6fd81652c521596510285bc04' 
  AND token = 'O3Q8MaGJR0X2pSrDqcZRGzgd2abHn08YI8jZjR/g5iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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