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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f296cf73b0c08327601c7c33a5c997e6d0dc8629db32d538c907c4b5848865e' 
  AND token = 'YeybJ/6NzfHX7GLOk/B1QNLw+BCTNdLd3fJz87Tr2CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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