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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33ff394a05a215afbd4d26dfbb9ffb45fc4a867251f5fb380a6b08cbea82d8b' 
  AND token = 'PT5SbyZPi3Bpj5P2jndemebcL+Cjb2UKJPxdlrXoWA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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