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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec93d9fefd82e15da4dae8ddbcd725ad6b7fc6a14f74ffdcd69c24dd60a4617' 
  AND token = 'Fwfc9DclT0JjFncrvTKDDrrqHKVIa9UJx2j84301NGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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