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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a329cf35ce43f27ea7b7eb3dd12e705eec0910a0460f231fa258d0642cdaeb9' 
  AND token = 'EfOy+TDbnVlzl2PSTCZ51wZjd1ZuugzOPwINK6GLffs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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