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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69da4a63621e39a2d4850de93ff14b920ad51f655eb91e998eb9765ae2716287' 
  AND token = 'Q9a92w4+8MBQDHcdlRrs/avZA8MS2PK64s+nwbckubI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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