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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536d3d2d0ca684d95b711dc604fded95760063efe330d9f71547e37f231e07e0' 
  AND token = 'hG5XIXnuaWBYUHnDBFNqFR00RfYkiMm7+Avgg/RbVqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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