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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86926f32a5ff0e9d92b5d19c1832fdc2bfa218e70fc6756a16883d36468a1532' 
  AND token = 'pATYHAec0qF2ZmsDDjHvlE7E6QSSoDfV++vgqEzamg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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