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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd344fb18ca03ac8bd1b28eb5bb936f7e0212bf11890823e44ebb4a2a3226a55' 
  AND token = '+HCKr+QI00m2mvP6GhMDue/U1bewCiRVuVg35X8yX84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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