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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73371f1e6ffdc7dba6fede7f13fffc5bfc5f353500f1a2d0bdadc1ad812598b8' 
  AND token = 'dOckDQnKB1dDpv9A6SeoYDxz0ssFAUUhxCbhRyNZWnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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