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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b928d5b1b574e60970b7b11f5cab559524e0d00aefb60f122ed690bf474f1d9e' 
  AND token = 'YIyIB5h4NFm/9hhAyTNI0drgnh5/d50rDpoVvKHb3L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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