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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b47caced48e8cb34dfc729d08b0c696dccf1c5bd58d057cfbb37d5cba8d8341' 
  AND token = '+IcC2y88ZMMH/cKOvLuigPkxm7NLVZrbzCH+9tUY2fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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