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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d69c27388c3f745dc53856a83d0e90f5ad241bbeeebe29d95ee473b4bf37b8e' 
  AND token = '8YtBC65THOy1Gwhy/Rl2p1QVILe9gGiY7levef9xmdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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