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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896073df3f0843e0ae0d5e4f7ca95941df247ac30d7001e97dff817427e48102' 
  AND token = 'XAT6tJoAL2IiNAR9YcBaBjDNs/01zM9UgJnZWqbUlVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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