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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470a640f008c715736d0120e742423b857290d1ff250691239a33fd30d32ec10' 
  AND token = 's773Xz0Rryy1aria0ObY40KO3xL+ErOMnwV6Na+F8hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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