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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e0ecda02ce8f8dbf96281ea44f8648bc108d1f212759e3410add6c0dca2824' 
  AND token = '7zPDIetAfuFVg12hhIKdyEhmYzXWDHNTcY8/nCXZFM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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