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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5303bcaff995b8a7c4cb32db723b689771336429c1b0cca068db4906d8172939' 
  AND token = '+c4GmxugL3eWCuog5oaZMjaCgnfX3gMIEzUt0404rWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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