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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d28c6b7e1837f079a15abfd046b592dd88bfd7b19ea7e05705f2cadb3f9a3e' 
  AND token = '3aXcdRho/lG02oyHn4urcE9O6LugZxouj/NnPDpTT08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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