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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7753f09dae3bc228a62254d78f780a99f667bda7bf3a5bea551ca08e8673835' 
  AND token = '5SCs9VZsnjRE6j2B5WbuTBCbbyAy4eIDNAUcmFyWf3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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