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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0c090a1b6dffdb222178c98a5c1f89f8247c1ff3eca71fa13b41ec17898aa2' 
  AND token = '6prPtm+keX+Q1Wvo9Vx2oFyqO8nShX2JTNEtn4ocLYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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