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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b70d5087d8cae3e2e0b84aae80b3c25bb2befaa463230a3154cc301b5f7a7db' 
  AND token = '/rr6IOkXAaaDKj9cC8FY4+cODcpsaTW1QG76FmWbHRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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