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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35eec1c5d765b477a54d6861507f34f42496a33460d0c606f242dc7e3032094' 
  AND token = '+w5y82YLo3oo+4UrTPaQ1a14RDnJr3f5VH6Z51IdykY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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