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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9984af91efbab26e0c96d45eeb8781ec85c49fce62e5086f5bdb487cc317b925' 
  AND token = 'lzUC3/WgvvDJMM1HdvQaaIeUBVWd5AbuQKhs05XM3xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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