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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c15411780ced53a563ce4125e5e502dc29ee867b942b25eff0da660d6401e3' 
  AND token = 'XarEY6BCq1fYD4oRflbH0mo2R1askfop09x6YRk7Si4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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