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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330ae17a178dc2ca07789302219ed45957158b0c3950873d3181aa3fb5fbc034' 
  AND token = 'z7laYG6g5RtuSTNeA0F0Y5lz6rjd0VSovycapHgffeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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